<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button>点击</button>
    <script>
        var btnEle = document.querySelector("button");
        function reform ( obj ){
            var newArr = [] ;
            for( var key in obj ){
                var str = key + '=' + obj[key] ; 
                newArr.push(str);
            }
            console.log(newArr.join("&"));
            return "?"+newArr.join("&");
        }
        var obj = {num1:10,num2:20};
        console.log(reform(obj));
    </script>
</body>
</html>